Find a gravel road with a good, level surface and get up to about 20 MPH and max out your brake controller. When you come to a stop, get out and look for the pile of gravel in front of each tire. There should be equal skid marks apparent on the road.
I shoot my brakes with an infrared thermometer. I took off the decorative cones from each wheel so that I can shoot the hub temps too. My brake temps are usually around 100-120 depending on how many stops I made just before taking the temps.
An infrared thermometer is very valuable for finding brakes that are not working at all, or brakes that are dragging.
